
Australia is an island continent surrounded by three oceans: the Indian Ocean to the west, the Pacific Ocean to the east, and the Southern Ocean to the south. The country is also bordered by several seas, including the Arafura Sea, the Coral Sea, the Tasman Sea, and the Timor Sea. The coastal waters of Australia extend 12 nautical miles from the coastline, within which the country has sovereignty over the sea bed and the airspace above. Australia's Exclusive Economic Zone (EEZ) stretches 200 nautical miles from the coastline, and the country has the right to explore, exploit, conserve, and manage all natural resources within this zone. The country is also home to several significant rivers, including the Murray River, the Darling River, and the Murrumbidgee River, as well as lakes such as Lake Eyre and Lake Argyle, which play crucial roles in the country's ecosystem and agriculture industry, respectively.
| Characteristics | Values |
|---|---|
| Oceans | Indian Ocean, Pacific Ocean, Southern Ocean |
| Seas | Arafura Sea, Coral Sea, Tasman Sea, Timor Sea, Great Australian Bight |
| Gulfs | Gulf of Carpentaria |
| Rivers | Murray River, Darling River, Murrumbidgee River, Lachlan River, Cooper Creek, Daintree River, Derwent River, Ord River, Asburton River |
| Lakes | Lake Argyle, Lake Eyre, Lake McKenzie, Lake St Clair, Dove Lake, Blue Lake |
| Reefs | Great Barrier Reef |
| Straits | Indonesian Archipelago |
| Currents | East Australian Current, Indonesian Throughflow, Leeuwin Current, Antarctic Circumpolar Current |
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What You'll Learn

The Indian Ocean borders Australia to the west
Australia is surrounded by water, with the Indian Ocean to the west, the Pacific Ocean to the east, and the Southern Ocean to the south. The Northern Territory and Western Australia share a border with the Indian Ocean.
The Indian Ocean is the third-largest of the world's five oceanic divisions, covering 70,560,000 square kilometres (27,240,000 square miles) or approximately 20% of the water area of Earth's surface. It is bounded by Asia and Africa to the north and west, and Australia to the east. To the south, it is bounded by the Southern Ocean or Antarctica, depending on the definition used. The Indian Ocean is the smallest, youngest, and most physically complex of the world's three major oceans (Pacific, Atlantic, and Indian). It is also the warmest ocean, with a significant impact on global climate due to its interaction with the atmosphere.
The Indian Ocean provides major sea routes connecting the Middle East, Africa, and East Asia with Europe and the Americas. It carries a heavy volume of petroleum and petroleum products from the oil fields of the Persian Gulf and Indonesia. The Indian Ocean is also a rich source of fish, with growing importance for bordering countries for both domestic consumption and export.
The Offshore Constitutional Settlement Acts of 1980 provide guidelines on the management of Australia's coastal waters, including the use of resources such as fishing and mining. Australia's Territorial Seas extend 12 nautical miles from the coast, and the country has the right to exercise its laws up to this limit.
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The Southern Ocean lies to the south of Australia
Australia is an island bordered by three of the world's oceans: the Indian Ocean, the Pacific Ocean, and the Southern Ocean. The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the world ocean, generally considered to be south of 60° S latitude and encircling Antarctica.
Historically, there has been debate among geographers regarding the definition of the Southern Ocean. Some argued that it should be defined as a body of water bound by the seasonally fluctuating Antarctic Convergence, where cold, northward-flowing waters from the Antarctic mix with warmer Subantarctic waters. Others contended that its waters should be treated as the southern limits of the Pacific, Atlantic, and Indian Oceans. The International Hydrographic Organization (IHO) settled the debate, defining the Southern Ocean as the body of water lying south of the northern limit of the Southern Ocean overturning circulation.
The Southern Ocean is the second smallest of the five principal oceanic divisions, covering an area of 21,960,000 km2 (8,480,000 sq mi). It is larger than the Arctic Ocean but smaller than the Pacific, Atlantic, and Indian Oceans. The Australian states of Western Australia, South Australia, and Victoria border the Southern Ocean.
The Southern Ocean is of ecological significance, with the Convention for the Conservation of Antarctic Marine Living Resources aiming to preserve marine life and environmental integrity in and near Antarctica. This convention was established due to concerns that increased krill catches in the Southern Ocean could negatively impact populations of other marine life dependent on krill for food. Many nations prohibit the exploration and exploitation of mineral resources south of the fluctuating Antarctic Convergence, which serves as the boundary between cold polar surface waters to the south and warmer waters to the north.
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The Tasman Sea separates Australia from New Zealand
The Tasman Sea, a marginal sea of the South Pacific Ocean, separates Australia and New Zealand. It covers an area of approximately 2.3 million square kilometres, with a maximum depth of 5,500 metres. The Tasman Sea is an important maritime route, connecting Australia and New Zealand with other countries in the Pacific region. It is a major trade route between the two countries and is responsible for a considerable volume of trade. The sea is named after Dutch explorer Abel Janszoon Tasman, who first crossed it in 1642.
The Tasman Sea is treacherous to cross during certain periods of the year due to poor wave conditions. It is bounded by the East Australian Current, which flows southwards from the tropics of the Coral Sea, and the Tasman Front, which flows east towards the north of New Zealand. The East Auckland Current runs down the west coast of New Zealand's North Island, while the East Cape Current is diverted towards the South Island by the shape of the Lord Howe Rise.
The Tasman Sea is home to a diverse range of marine life, including whales, dolphins, seals, and various species of fish. It also features several midsea island groups and coastal islands near the Australian and New Zealand mainlands. The Māori people of New Zealand call this sea Te Moana-a-Rehua, meaning 'the sea of Rehua'.
In addition to its economic importance, the Tasman Sea has also played a role in connecting Australia and New Zealand through telecommunications. In 1876, the first telegraph cable linking the two countries was laid in the Tasman Sea, although it was later made obsolete by the Commonwealth Pacific Cable in 1963.
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The Great Barrier Reef is a natural wonder off the coast of Queensland
Australia is an island country that borders three oceans: the Indian Ocean, the Pacific Ocean, and the Southern Ocean. The Pacific Ocean, specifically, is to the east of the country, with the Tasman Sea being a part of it. The Tasman Sea is an important body of water that separates Australia from New Zealand.
The Great Barrier Reef is renowned for its stunning coral formations and diverse marine life. It is home to over 1,500 species of fish, with some sources citing over 1,600 species, and 600 types of coral. The reef also hosts six of the world's seven marine turtle species and rare species of whales. The warm, clear waters and accessibility from tourist boats called "live aboards" make the Great Barrier Reef a popular destination for scuba divers and snorkelers.
The reef's formation is a result of Queensland's geological history. Approximately 24 million years ago, when Queensland edged into tropical waters, some coral grew. However, a sedimentation regime quickly developed due to the erosion of the Great Dividing Range, creating conditions unfavourable for coral growth. About 10 million years ago, a significant drop in sea level further enabled sedimentation. During an Interglacial period around 400,000 years ago, there were higher sea levels and a notable increase in water temperature. The land that now forms the substrate of the Great Barrier Reef was a coastal plain created from the eroded sediments of the Great Dividing Range, with some remnants of older reefs and volcanoes.
The Great Barrier Reef has over 100 islands, ranging from exotic locations to famous destinations like the Whitsundays. The reef's islands feature pristine scenery, unspoiled beaches, and tropical rainforests. The cities of Cairns, Townsville, Rockhampton, Mackay, Bundaberg, and Maryborough serve as popular access points for exploring the reef.
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The Murray River is the longest river in Australia
The Murray River, also known as the River Murray, is the longest river in Australia, spanning 2,508 kilometres (1,558 miles) and supporting a range of ecosystems and communities. It rises in the Australian Alps, draining the western side of Australia's highest mountains, then meanders northwest across Australia's inland plains, forming the border between the states of New South Wales and Victoria as it flows into South Australia.
The Murray River is widely considered Australia's most important irrigated region. Its catchments form the Murray-Darling Basin, which covers about one-seventh of Australia's total area. The basin is crucial for agriculture, providing water to approximately 1.5 million households, farms, and other businesses. It also produces 54% of Australia's apples and a whopping 95% of its oranges.
The health of the Murray River has declined significantly since European settlement, particularly due to the regulation of its flows. Extreme droughts between 2000 and 2007 severely impacted the river red gum forests, raising concerns about their long-term survival. The river has also experienced significant flooding, with the most notable event occurring in 1956, lasting for up to six months and inundating many towns in South Australia.
The Murray River is home to a diverse range of native fish species, including the famous Murray cod, trout cod, golden perch, Macquarie perch, silver perch, eel-tailed catfish, Australian smelt, and western carp gudgeon. Additionally, the river supports other aquatic species such as the Murray short-necked turtle, broad-clawed yabbies, and the large-clawed Macrobrachium shrimp. The river also supports fringing corridors and forests of river red gum trees.
The Murray River is an essential water source and a significant ecological region in Australia, providing irrigation, supporting agriculture, and sustaining a variety of unique ecosystems and communities.
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Frequently asked questions
Australia borders three of the world's oceans: the Indian Ocean, the Pacific Ocean, and the Southern Ocean.
The seas found along Australia include the Arafura Sea, the Coral Sea, the Tasman Sea, the Timor Sea, and the Gulf of Carpentaria.
The major rivers in Australia include the Murray River, the Darling River, the Murrumbidgee River, the Lachlan River, and the Cooper Creek.
Some of the famous lakes in Australia are Lake Argyle, Lake Eyre, and Dove Lake.
The Great Barrier Reef is one of Australia's most iconic natural wonders, known for its stunning coral formations and diverse marine life.




























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